Ampex 200, seven channel, magnetic tape recorder is used 
to record all necessary data at a rate of five (5) times 
per second. Unique features of Shiran are its calibration 
built-in test, and four station ranging capability. Cali 
bration of the airborne subsystem can be accomplished by 
simply pressing a calibrate button. The subsystem, 
utilizing a built-in test oscillator, measures the phase 
delay and places it in memory. This phase delay is auto 
matically subtracted from each subsequent range measure 
ment. System calibration is accomplished within ten (10) 
seconds. Calibration can also be checked at any time to 
guard against drift. Additional built-in test features 
have been incorporated that allow for check-out of the 
system while airborne. Malfunctions in the system can be 
detected and pinpointed. By use of a maintenance adapter, 
the system can be repaired. These built-in test features 
were used exclusively during the flight test and proved 
out well. Because of these features, no test support 
equipment was required at the flight test site. The most 
important feature of the Shiran system is its four station 
ranging capability. This feature gives the system flexi 
bility, increases its reliability, and enables the perfor 
mance of controlled photography missions that become most 
difficult with any two channel system.